ex4.3 implement jest tests

5 files changed, 842 insertions, 243 deletions

diff --git a/part4/blog/.eslintrc.js b/part4/blog/.eslintrc.js
new file mode 100644
index 0000000..40b9a81
--- /dev/null
+++ b/part4/blog/.eslintrc.js
@@ -0,0 +1,8 @@
+module.exports = {
+  'env': {
+    'commonjs': true,
+    'es2021': true,
+    'node': true,
+    'jest': true
+  }
+}
diff --git a/part4/blog/package-lock.json b/part4/blog/package-lock.json
index 11249bf..d680165 100644
--- a/part4/blog/package-lock.json
+++ b/part4/blog/package-lock.json
@@ -20,6 +20,9 @@
         "web-vitals": "^2.1.4"
       },
       "devDependencies": {
+        "dotenv": "^16.3.1",
+        "eslint": "^8.43.0",
+        "jest": "^27.5.1",
         "nodemon": "^2.0.22"
       }
     },
@@ -2564,6 +2567,25 @@
         "node": ">=8"
       }
     },
+    "node_modules/@jest/console/node_modules/jest-message-util": {
+      "version": "27.5.1",
+      "resolved": "https://registry.npmjs.org/jest-message-util/-/jest-message-util-27.5.1.tgz",
+      "integrity": "sha512-rMyFe1+jnyAAf+NHwTclDz0eAaLkVDdKVHHBFWsBWHnnh5YeJMNWWsv7AbFYXfK3oTqvL7VTWkhNLu1jX24D+g==",
+      "dependencies": {
+        "@babel/code-frame": "^7.12.13",
+        "@jest/types": "^27.5.1",
+        "@types/stack-utils": "^2.0.0",
+        "chalk": "^4.0.0",
+        "graceful-fs": "^4.2.9",
+        "micromatch": "^4.0.4",
+        "pretty-format": "^27.5.1",
+        "slash": "^3.0.0",
+        "stack-utils": "^2.0.3"
+      },
+      "engines": {
+        "node": "^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"
+      }
+    },
     "node_modules/@jest/console/node_modules/supports-color": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
@@ -2674,6 +2696,25 @@
         "node": ">=8"
       }
     },
+    "node_modules/@jest/core/node_modules/jest-message-util": {
+      "version": "27.5.1",
+      "resolved": "https://registry.npmjs.org/jest-message-util/-/jest-message-util-27.5.1.tgz",
+      "integrity": "sha512-rMyFe1+jnyAAf+NHwTclDz0eAaLkVDdKVHHBFWsBWHnnh5YeJMNWWsv7AbFYXfK3oTqvL7VTWkhNLu1jX24D+g==",
+      "dependencies": {
+        "@babel/code-frame": "^7.12.13",
+        "@jest/types": "^27.5.1",
+        "@types/stack-utils": "^2.0.0",
+        "chalk": "^4.0.0",
+        "graceful-fs": "^4.2.9",
+        "micromatch": "^4.0.4",
+        "pretty-format": "^27.5.1",
+        "slash": "^3.0.0",
+        "stack-utils": "^2.0.3"
+      },
+      "engines": {
+        "node": "^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"
+      }
+    },
     "node_modules/@jest/core/node_modules/supports-color": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
@@ -2734,6 +2775,89 @@
         "node": "^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"
       }
     },
+    "node_modules/@jest/fake-timers/node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
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+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/@jest/fake-timers/node_modules/chalk": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
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+      "dependencies": {
+        "ansi-styles": "^4.1.0",
+        "supports-color": "^7.1.0"
+      },
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+        "node": ">=10"
+      },
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+      }
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+    "node_modules/@jest/fake-timers/node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
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+      },
+      "engines": {
+        "node": ">=7.0.0"
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+    },
+    "node_modules/@jest/fake-timers/node_modules/color-name": {
+      "version": "1.1.4",
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+    },
+    "node_modules/@jest/fake-timers/node_modules/has-flag": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
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+      "engines": {
+        "node": ">=8"
+      }
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+    "node_modules/@jest/fake-timers/node_modules/jest-message-util": {
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+      "resolved": "https://registry.npmjs.org/jest-message-util/-/jest-message-util-27.5.1.tgz",
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+      "dependencies": {
+        "@babel/code-frame": "^7.12.13",
+        "@jest/types": "^27.5.1",
+        "@types/stack-utils": "^2.0.0",
+        "chalk": "^4.0.0",
+        "graceful-fs": "^4.2.9",
+        "micromatch": "^4.0.4",
+        "pretty-format": "^27.5.1",
+        "slash": "^3.0.0",
+        "stack-utils": "^2.0.3"
+      },
+      "engines": {
+        "node": "^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"
+      }
+    },
+    "node_modules/@jest/fake-timers/node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/@jest/globals": {
       "version": "27.5.1",
       "resolved": "https://registry.npmjs.org/@jest/globals/-/globals-27.5.1.tgz",
@@ -2747,6 +2871,139 @@
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       }
     },
+    "node_modules/@jest/globals/node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
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+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/@jest/globals/node_modules/chalk": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
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+        "supports-color": "^7.1.0"
+      },
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+      },
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+    "node_modules/@jest/globals/node_modules/color-convert": {
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+        "jest-message-util": "^27.5.1"
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+      "dependencies": {
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+        "@jest/types": "^27.5.1",
+        "@types/stack-utils": "^2.0.0",
+        "chalk": "^4.0.0",
+        "graceful-fs": "^4.2.9",
+        "micromatch": "^4.0.4",
+        "pretty-format": "^27.5.1",
+        "slash": "^3.0.0",
+        "stack-utils": "^2.0.3"
+      },
+      "engines": {
+        "node": "^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"
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+    },
+    "node_modules/@jest/globals/node_modules/supports-color": {
+      "version": "7.2.0",
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     "node_modules/@jest/reporters": {
       "version": "27.5.1",
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@@ -2863,14 +3120,14 @@
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+      "version": "29.4.3",
+      "resolved": "https://registry.npmjs.org/@jest/schemas/-/schemas-29.4.3.tgz",
+      "integrity": "sha512-VLYKXQmtmuEz6IxJsrZwzG9NvtkQsWNnWMsKxqWNu3+CnfzJQhp0WDDKWLVV9hLKr0l3SLLFRqcYHjhtyuDVxg==",
       "dependencies": {
-        "@sinclair/typebox": "^0.24.1"
+        "@sinclair/typebox": "^0.25.16"
       },
       "engines": {
-        "node": "^12.13.0 || ^14.15.0 || ^16.10.0 || >=17.0.0"
+        "node": "^14.15.0 || ^16.10.0 || >=18.0.0"
       }
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@@ -3349,9 +3606,9 @@
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@@ -4077,193 +4334,6 @@
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+      "version": "27.5.1",
+      "resolved": "https://registry.npmjs.org/jest-diff/-/jest-diff-27.5.1.tgz",
+      "integrity": "sha512-m0NvkX55LDt9T4mctTEgnZk3fmEg3NRYutvMPWM/0iPnkFj2wIeF45O1718cMSOFO1vINkqmxqD8vE37uTEbqw==",
+      "dependencies": {
+        "chalk": "^4.0.0",
+        "diff-sequences": "^27.5.1",
+        "jest-get-type": "^27.5.1",
+        "pretty-format": "^27.5.1"
+      },
+      "engines": {
+        "node": "^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"
+      }
+    },
+    "node_modules/jest-snapshot/node_modules/jest-matcher-utils": {
+      "version": "27.5.1",
+      "resolved": "https://registry.npmjs.org/jest-matcher-utils/-/jest-matcher-utils-27.5.1.tgz",
+      "integrity": "sha512-z2uTx/T6LBaCoNWNFWwChLBKYxTMcGBRjAt+2SbP929/Fflb9aa5LGma654Rz8z9HLxsrUaYzxE9T/EFIL/PAw==",
+      "dependencies": {
+        "chalk": "^4.0.0",
+        "jest-diff": "^27.5.1",
+        "jest-get-type": "^27.5.1",
+        "pretty-format": "^27.5.1"
+      },
+      "engines": {
+        "node": "^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"
+      }
+    },
+    "node_modules/jest-snapshot/node_modules/jest-message-util": {
+      "version": "27.5.1",
+      "resolved": "https://registry.npmjs.org/jest-message-util/-/jest-message-util-27.5.1.tgz",
+      "integrity": "sha512-rMyFe1+jnyAAf+NHwTclDz0eAaLkVDdKVHHBFWsBWHnnh5YeJMNWWsv7AbFYXfK3oTqvL7VTWkhNLu1jX24D+g==",
+      "dependencies": {
+        "@babel/code-frame": "^7.12.13",
+        "@jest/types": "^27.5.1",
+        "@types/stack-utils": "^2.0.0",
+        "chalk": "^4.0.0",
+        "graceful-fs": "^4.2.9",
+        "micromatch": "^4.0.4",
+        "pretty-format": "^27.5.1",
+        "slash": "^3.0.0",
+        "stack-utils": "^2.0.3"
+      },
+      "engines": {
+        "node": "^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"
+      }
+    },
     "node_modules/jest-snapshot/node_modules/supports-color": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
@@ -11366,6 +11914,17 @@
         "node": ">=8"
       }
     },
+    "node_modules/jest-watch-typeahead/node_modules/@jest/schemas": {
+      "version": "28.1.3",
+      "resolved": "https://registry.npmjs.org/@jest/schemas/-/schemas-28.1.3.tgz",
+      "integrity": "sha512-/l/VWsdt/aBXgjshLWOFyFt3IVdYypu5y2Wn2rOO1un6nkqIn8SLXzgIMYXFyYsRWDyF5EthmKJMIdJvk08grg==",
+      "dependencies": {
+        "@sinclair/typebox": "^0.24.1"
+      },
+      "engines": {
+        "node": "^12.13.0 || ^14.15.0 || ^16.10.0 || >=17.0.0"
+      }
+    },
     "node_modules/jest-watch-typeahead/node_modules/@jest/test-result": {
       "version": "28.1.3",
       "resolved": "https://registry.npmjs.org/@jest/test-result/-/test-result-28.1.3.tgz",
@@ -11396,6 +11955,11 @@
         "node": "^12.13.0 || ^14.15.0 || ^16.10.0 || >=17.0.0"
       }
     },
+    "node_modules/jest-watch-typeahead/node_modules/@sinclair/typebox": {
+      "version": "0.24.51",
+      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.24.51.tgz",
+      "integrity": "sha512-1P1OROm/rdubP5aFDSZQILU0vrLCJ4fvHt6EoqHEM+2D/G5MK3bIaymUKLit8Js9gbns5UyJnkP/TZROLw4tUA=="
+    },
     "node_modules/jest-watch-typeahead/node_modules/@types/yargs": {
       "version": "17.0.24",
       "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-17.0.24.tgz",
@@ -14875,6 +15439,14 @@
         }
       }
     },
+    "node_modules/react-scripts/node_modules/dotenv": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-10.0.0.tgz",
+      "integrity": "sha512-rlBi9d8jpv9Sf1klPjNfFAuWDjKLwTIJJ/VxtoTwIR6hnZxcEOQCZg2oIL3MWBYw5GpUDKOEnND7LXTbIpQ03Q==",
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/read-cache": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/read-cache/-/read-cache-1.0.0.tgz",
diff --git a/part4/blog/package.json b/part4/blog/package.json
index 9baef88..e82f1af 100644
--- a/part4/blog/package.json
+++ b/part4/blog/package.json
@@ -17,7 +17,7 @@
   "scripts": {
     "start": "nodemon --verbose start",
     "build": "react-scripts build",
-    "test": "react-scripts test",
+    "test": "jest --verbose",
     "eject": "react-scripts eject"
   },
   "eslintConfig": {
@@ -39,6 +39,12 @@
     ]
   },
   "devDependencies": {
+    "dotenv": "^16.3.1",
+    "eslint": "^8.43.0",
+    "jest": "^27.5.1",
     "nodemon": "^2.0.22"
+  },
+  "jest": {
+    "testEnvironment": "node"
   }
 }
diff --git a/part4/blog/tests/list_helper.test.js b/part4/blog/tests/list_helper.test.js
new file mode 100644
index 0000000..e10f374
--- /dev/null
+++ b/part4/blog/tests/list_helper.test.js
@@ -0,0 +1,8 @@
+const listHelper = require('../utils/list_helper.js')
+
+test('dummy returns one', () => {
+  const blogs = []
+
+  const result = listHelper.dummy(blogs)
+  expect(result).toBe(1)
+})
diff --git a/part4/blog/utils/list_helper.js b/part4/blog/utils/list_helper.js
new file mode 100644
index 0000000..e52c23c
--- /dev/null
+++ b/part4/blog/utils/list_helper.js
@@ -0,0 +1,5 @@
+const dummy = (blogs) => {
+  return 1
+}
+
+module.exports = {dummy}